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manage audio file metadata using external text files

Project description

Introduction

kantag is a set of Python libraries and tools for managing audio file (flac, ogg vorbis, mp3, and m4a) metadata using external text files called “kantag files”. The format of the file is identical regardless of audio file type. Included is a tool to generate the text file from existing tags, path, and MusicBrainz data, initkan; a tool to write the metadata to the audio file tags, applykan; and a tool to display metadata, showkan. A typical kantag file would have lines that look like like this:

# Album / common track info
a AlbumArtist=Rush
a AlbumArtistSort=Rush
a Album=2112
a Date=1976-03-12

a Composer=Geddy Lee
a ComposerSort=Lee, Geddy
t 01-05 Composer=Alex Lifeson
t 01-05 ComposerSort=Lifeson, Alex
t 01-03,06 Lyricist=Neil Peart
t 01-03,06 LyricistSort=Peart, Neil

t 01 Title=2112
t 01 Part=1. Overture
t 01 Part=2. The Temples of Syrinx
t 01 Part=3. Discovery
t 01 Part=4. Presentation
t 01 Part=5. Oracle: The Dream
t 01 Part=6. Soliloquy
t 01 Part=7. Grand Finale

Typical Usage

In a typical kantag workflow, the user will have an album of audio files, whether ripped from a CD, purchased from an online store, downloaded from Bandcamp, or another source. In most cases, the files will already contain metadata tags. MusicBrainz Picard is a recommended choice for setting the initial metadata, especially for files ripped from physical media. The tool initkan will produce a baseline file for a set of audio files:

$ initkan -v -b=y -M=y *.ogg > tags.kan

The output would typically be retained as a file in the same folder as the audio files, as in the above example. Then, the file can be edited by any available text editor, to meet the user’s personal tastes. Note, there are additional tags recognized by by the kantag tools that are not necessary output by initkan. To write the tags back to the audio files, use applykan:

$ applykan -v tags.kan *.ogg

Installation

Warning

Some Linux distributions discourage installation of system-level python packages using pip or setup.py install, due to collisions with the system package manager. In those cases, dependencies should be installed through the package manager, if possible, or choose a user folder installation method.

Installing with pip

If your system has pip installed, and you have access to install software in the system packages, then kantag kan be installed as administrator from PyPI:

# pip install kantag

If you do not have access to install system packages, or do not wish to install in the system location, it can be installed in a user folder:

$ pip install --user kantag

Installing from source

Either download a release tarball from the Downloads page, and unpack:

$ tar zxvf kantag-1.1.0.tar.gz

Or get the latest source from the Mercurial repository:

$ hg clone https://bitbucket.org/dgasaway/kantag

If you have access to install software in the system packages, then it can be installed as administrator:

# python setup.py install

If you do not have access to install system packages, or do not wish to install in the system location, it can be installed in a user folder:

$ python setup.py install --user

File Format

Overall, if the kantag file contains any non-ASCII characters, it should be UTF-8 encoded without BOM. Each line is parsed according to the rules below. Blank lines are allowed and ignored.

Line format

The first character of a line indicates the line type:

Char Description
# A comment line that will be ignored.
a A tag that will be applied to all files.
d A tag that will be applied to selected discs.
t A tag that will be applied to selected tracks.

For disc and track types, next is a space followed by a list of disc/track numbers to which the tag applies. The list is comma separated and may contain ranges indicated by a hyphen. Some examples:

Selector Description
t 10 Applies to track 10.
d 2 Applies to all tracks on disc 2.
d 1-3 Applies to all tracks on discs 1, 2, and 3.
t 01,05-07,10 Applies to tracks 1, 5, 6, 7, and 10.

The numbers may need to be zero padded as in the above track example if the audio filename has the disc or track number zero padded. This can also depend on the setting the --path-regex option passed to applykan. With default settings, track numbers should be padded to two digits in the kantag file and in filenames. In addition, when working with a multi-disc release, track numbers should be prepended with the disc number, as in these examples:

Selector Description
t 101-103 Applies to tracks 1 to 3 of disc 1.
t 105,201-202 Applies to track 5 of disc 1, and tracks 1 and 2 of disc 2.

Next comes a space and the tag name/value pair separated by an equal sign. Anything before the first equal sign will be used as the tag name, anything after and to the end of the line is the value. Putting it all together, you have something like this:

t 07 Composer=Jaromír Weinberger

There is no support for multi-line values. Instead, use multiple instances of the tag:

t 07 Comment=Work premièred in 1927.
t 07 Comment=Known in English as "Švanda the Bagpiper" or "Schwanda the Bagpiper".

Project details


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